body {
    padding: 0px;
    margin: 0px;
    border: none;
}
.container{
    align-items: center;
    padding: 50px;
    width: 500px;
    font-weight: bold;
}
.col-3 {
    font-size: large;
    font-weight: bold;
    border: none;
    background-color: #b9bdc2;
    padding: 25px;
    /* border-radius: 30px; */
    box-shadow: inset 5px 5px 12px #f8ebeb,
                      5px 5px 12px rgba(0, 0, 0, .16);
              
}
.equal {
    font-size: large;
    font-weight: bold;
    background-color: #b9bdc2;
    padding: 25px;
    border: none;
    
    /* border-radius: 30px; */
    box-shadow: inset 5px 5px 12px #ffffff,
                      5px 5px 12px rgba(0, 0, 0, .16);
}
.col-12 {
    background-color: #b9bdc2;
    padding: 25px;
    height: 150px;
    border: none;
    text-align: end;
    font-size: 50px;
    font-weight: bold;
    padding: 15px;
    border-radius: 30px;
    box-shadow: inset 5px 5px 12px #e0c0c0,
                      5px 5px 12px rgba(0, 0, 0, .16);
}